build(deps): bump sorbet from 0.5.5949 to 0.5.6006 in /Library/Homebrew

Bumps [sorbet](https://github.com/sorbet/sorbet) from 0.5.5949 to 0.5.6006
- [Release notes](https://github.com/sorbet/sorbet/releases)
- [Commits](https://github.com/sorbet/sorbet/commits

)

Signed-off-by: dependabot[bot] <support@github.com>

Fix upgrading dependents on missing keg

Maintainer-Guidelines: give maintainers time to review enhancements.

Ensure that we don't try to check for broken linkage in a keg that
doesn't exist. Furthermore, fix the reason we checked for the keg that
doesn't exist by `Formula.clear_cache`.

While here, I noticed that there was other methods of caching at use in
`Formula` so consolidate them to be consistent.

Fixes #8997

bug fix: add missing header param to url class

shared_audits: add syntax-highlight to GITHUB_PRERELEASE_ALLOWLIST

Refresh installed list before dependency check

sorbet: Update RBI files.

xcode_requirement: support linux

install: tweak missing formula behaviour.

mac/xcode: version bumps for Xcode 12.1

Autogenerated by the [sorbet](https://github.com/Homebrew/brew/blob/master/.github/workflows/sorbet.yml) workflow.

2020-10-12T21:29:03.7866574Z [31mError:[0m undefined method `latest_version' for OS::Mac::Xcode:Module
2020-10-12T21:29:03.7867686Z /home/linuxbrew/.linuxbrew/Homebrew/Library/Homebrew/requirements/xcode_requirement.rb:33:in `message'
2020-10-12T21:29:03.7868902Z /home/linuxbrew/.linuxbrew/Homebrew/Library/Taps/homebrew/homebrew-test-bot/lib/tests/formulae.rb:199:in `map'
2020-10-12T21:29:03.7870227Z /home/linuxbrew/.linuxbrew/Homebrew/Library/Taps/homebrew/homebrew-test-bot/lib/tests/formulae.rb:199:in `satisfied_requirements?'
2020-10-12T21:29:03.7871547Z /home/linuxbrew/.linuxbrew/Homebrew/Library/Taps/homebrew/homebrew-test-bot/lib/tests/formulae.rb:593:in `formula!'
2020-10-12T21:29:03.7873156Z /home/linuxbrew/.linuxbrew/Homebrew/Library/Taps/homebrew/homebrew-test-bot/lib/tests/formulae.rb:20:in `block in run!'
2020-10-12T21:29:03.7875029Z /home/linuxbrew/.linuxbrew/Homebrew/Library/Taps/homebrew/homebrew-test-bot/lib/tests/formulae.rb:19:in `each'
2020-10-12T21:29:03.7876299Z /home/linuxbrew/.linuxbrew/Homebrew/Library/Taps/homebrew/homebrew-test-bot/lib/tests/formulae.rb:19:in `run!'
2020-10-12T21:29:03.7877495Z /home/linuxbrew/.linuxbrew/Homebrew/Library/Taps/homebrew/homebrew-test-bot/lib/test_runner.rb:119:in `run_tests'
2020-10-12T21:29:03.7878705Z /home/linuxbrew/.linuxbrew/Homebrew/Library/Taps/homebrew/homebrew-test-bot/lib/test_runner.rb:36:in `block in run!'
2020-10-12T21:29:03.7879908Z /home/linuxbrew/.linuxbrew/Homebrew/Library/Homebrew/vendor/portable-ruby/2.6.3_2/lib/ruby/2.6.0/delegate.rb:83:in `each'
2020-10-12T21:29:03.7881136Z /home/linuxbrew/.linuxbrew/Homebrew/Library/Homebrew/vendor/portable-ruby/2.6.3_2/lib/ruby/2.6.0/delegate.rb:83:in `method_missing'
2020-10-12T21:29:03.7882519Z /home/linuxbrew/.linuxbrew/Homebrew/Library/Taps/homebrew/homebrew-test-bot/lib/test_runner.rb:25:in `run!'
2020-10-12T21:29:03.7883735Z /home/linuxbrew/.linuxbrew/Homebrew/Library/Taps/homebrew/homebrew-test-bot/lib/test_bot.rb:126:in `run!'
2020-10-12T21:29:03.7884875Z /home/linuxbrew/.linuxbrew/Homebrew/Library/Taps/homebrew/homebrew-test-bot/cmd/test-bot.rb:75:in `test_bot'
2020-10-12T21:29:03.7885882Z /home/linuxbrew/.linuxbrew/Homebrew/Library/Homebrew/brew.rb:119:in `<main>'

update-test: improve debugging output.

- Run `brew search` for local formulae first (as it's quickest) rather
  than checking Git history.
- Don't output `Searching taps...` because `Searching taps on GitHub...`
  is output by the called function (and because it'll say it's searching
  taps even when it is not if `HOMEBREW_NO_GITHUB_API` is set).

Output more information about the refs and commit message for the start,
expected and actual end commits to ease debugging.

Let's slow down a little on enhancement PRs to give other maintainers
time to give their feedback.

This is mostly self-directed criticism.

cmd/info: Add support for casks in brew info

build(deps): bump simplecov from 0.19.0 to 0.19.1 in /Library/Homebrew

Add support for npm 7

Bumps [simplecov](https://github.com/simplecov-ruby/simplecov) from 0.19.0 to 0.19.1.
- [Release notes](https://github.com/simplecov-ruby/simplecov/releases)
- [Changelog](https://github.com/simplecov-ruby/simplecov/blob/main/CHANGELOG.md)
- [Commits](https://github.com/simplecov-ruby/simplecov/compare/v0.19.0...v0.19.1

)

Signed-off-by: dependabot[bot] <support@github.com>

Remove `infrakit` from `GITHUB_PRERELEASE_ALLOWLIST` as it's deprecated

Allow python@3.9 to be non-keg-only

shared_audits: add nuclear to GITHUB_PRERELEASE_ALLOWLIST

Remove IRC mention from README.md

Co-Authored-By: Mike McQuaid <mike@mikemcquaid.com>

Removed IRC mention (#machomebrew). This IRC channel is not being actively used by our community ( 0 active users ).

Add more license symbol functionality